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- MPL-A420P-SK72AA
- Servo Motor
- USA
- 115 mm
- 4.3 kg
- Xiamen, China
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Product Overview
The Allen Bradley MPL-A420P-SK72AA Servo Motor is an industrial AC servo motor designed for automated motion-control systems. As part of the Allen Bradley MPL servo motor family, it is intended for machinery that requires controlled rotary movement, repeatable positioning, coordinated axis operation, and reliable motion performance.
The MPL-A420P-SK72AA is normally integrated into a complete servo system consisting of a motion controller, compatible servo drive, feedback system, mechanical transmission, and machine load. The motion controller determines the required movement, while the servo drive regulates motor operation and the feedback system supports closed-loop control.
The supplied specifications identify the motor with a 115 mm frame size and a weight of 4.3 kg. These values are important for machine mounting, cabinet and equipment layout, mechanical design, transportation, maintenance, and spare-parts planning.
The motor can be considered for industrial applications including automated assembly, packaging, material handling, production machinery, indexing equipment, and other motion-control systems where the complete electrical and mechanical requirements are compatible.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Allen Bradley |
| Model | MPL-A420P-SK72AA |
| Product Type | AC Servo Motor |
| Product Family | MPL Series |
| Motor Technology | Permanent Magnet Servo Motor |
| Frame Size | 115 mm |
| Weight | 4.3 kg |
| Application | Industrial Motion Control |
| Control Method | Closed-Loop Servo Control |
| Installation | Machine-Mounted |
| Drive Interface | Compatible Servo Drive |
| Feedback | Verify according to motor nameplate and system configuration |
| Electrical Ratings | Verify according to applicable technical documentation |
| Typical Applications | Packaging, Assembly, Material Handling, Production Automation, Positioning Systems |
Technical note: Exact motor ratings such as torque, rated speed, peak speed, voltage, current, feedback configuration, shaft dimensions, connector arrangement, duty cycle, and other model-specific characteristics should be verified from the motor nameplate and applicable technical documentation before installation or replacement.
What Is the Allen Bradley MPL-A420P-SK72AA?
The Allen Bradley MPL-A420P-SK72AA is an industrial servo motor designed to produce controlled rotary motion within an automated machine.
A servo motor is normally operated through a closed-loop control architecture. The motion controller generates the desired movement, the servo drive supplies regulated electrical power to the motor, and feedback information allows the control system to monitor actual motor operation.
A simplified system architecture is:
Motion Controller → Servo Drive → MPL-A420P-SK72AA → Mechanical Load
Feedback information is incorporated into the servo control loop.
This arrangement allows the motor to support machine functions such as:
- Automated positioning
- Speed regulation
- Indexing
- Acceleration and deceleration
- Repetitive motion
- Coordinated axis movement
- Programmable machine sequences
- Synchronized mechanical operation
The supplied 115 mm frame size provides an important reference for mechanical integration, while the 4.3 kg weight should be considered during installation and service activities.
Servo Motor Working Principle
The MPL-A420P-SK72AA works as part of a closed-loop servo-control system.
The general operating sequence is:
- The motion controller generates a movement command.
- The servo drive receives and processes the command.
- The drive regulates electrical power supplied to the motor.
- The motor generates controlled rotary torque.
- Mechanical components transfer the motor movement to the machine load.
- Feedback information is monitored by the control system.
- The servo drive adjusts motor operation according to the required motion.
This closed-loop process enables automated equipment to perform controlled and repeatable movement.
For example, an automated machine axis may need to accelerate, move to a specified location, decelerate, and stop. The servo system manages this movement according to the programmed motion profile.
Actual performance depends on the complete system, including the servo drive, feedback arrangement, controller, mechanical transmission, load inertia, and tuning parameters.
Main Functions
Controlled Rotary Motion
The primary purpose of the MPL-A420P-SK72AA is to provide controlled mechanical rotation for an automated machine axis.
Position Control
When paired with a suitable servo drive and motion controller, the motor can participate in automated positioning operations.
Speed Regulation
The servo system can regulate motor operation according to the required speed profile.
Controlled Acceleration
The motor can participate in programmed acceleration profiles to achieve controlled machine movement.
Controlled Deceleration
The servo system can manage deceleration according to the requirements of the machine sequence.
Repetitive Machine Motion
The motor can support repeated movement cycles in automated production systems.
Multi-Axis Coordination
Multiple servo axes can be coordinated through a suitable motion-control architecture.
Role in Industrial Automation
The MPL-A420P-SK72AA acts as the motor element of an automated motion-control axis.
A typical system can be represented as:
PLC / Motion Controller
↓
Motion Command
↓
Servo Drive
↓
MPL-A420P-SK72AA Servo Motor
↓
Coupling / Mechanical Transmission
↓
Machine Load
Feedback information is used as part of the closed-loop control process.
This allows the servo motor to participate in:
- Feeding systems
- Indexing mechanisms
- Positioning systems
- Transfer equipment
- Automated assembly
- Production machinery
- Coordinated machine movement
The motor therefore functions as one component within a complete industrial automation architecture.
Industrial Applications
Packaging Machinery
Packaging equipment often requires precise movement for feeding, indexing, cutting, sealing, labeling, and product positioning.
Servo motors can provide controlled motion when appropriately matched to the machine load and drive system.
Automated Assembly
Assembly machines can use servo-controlled axes to position tools, components, fixtures, and workpieces.
Material Handling
Servo motors can be used in transfer mechanisms, positioning systems, indexing equipment, and other controlled material-handling applications.
Machine Tools
Automated machine tools may use servo motors for controlled axis movement and coordinated mechanical processes.
Printing and Converting
Printing and converting equipment can require synchronized movement between rollers, feeders, cutters, and other machine mechanisms.
Production Automation
Manufacturing equipment can use servo motors for repetitive and programmable movement sequences.
Specialized Motion Systems
The MPL-A420P-SK72AA can also be integrated into specialized machinery where controlled rotary motion is required and the complete system requirements are satisfied.
Mechanical Integration
The 115 mm frame size should be considered during mechanical design and installation.
Before mounting the MPL-A420P-SK72AA, verify:
- Mounting dimensions
- Mounting-hole arrangement
- Shaft dimensions
- Shaft extension
- Coupling requirements
- Mechanical alignment
- Installation clearance
- Cable routing
- Load characteristics
- Environmental conditions
The supplied motor weight is 4.3 kg.
The machine mounting structure should be sufficiently rigid to support the motor and withstand dynamic forces generated during acceleration, deceleration, and normal operation.
Correct shaft alignment is essential. Mechanical misalignment can increase vibration, coupling stress, bearing loading, and mechanical wear.
Servo Drive Integration
The MPL-A420P-SK72AA should be connected to a servo drive confirmed to be compatible with the complete motor configuration.
Compatibility should not be determined solely by the MPL series or frame size.
Important considerations include:
- Complete motor model
- Motor electrical characteristics
- Feedback configuration
- Servo drive capacity
- Required motor speed
- Acceleration requirements
- Machine load
- Duty cycle
- Motion controller architecture
- Motor and feedback cables
- Machine safety requirements
The servo drive should be correctly configured for the installed motor before normal operation.
Installation Guidelines
Verify Motor Identification
Confirm the complete model designation as MPL-A420P-SK72AA before installation.
Record the motor nameplate information for commissioning and maintenance purposes.
Inspect the Motor
Check the motor housing, shaft, mounting surfaces, connectors, and cables for visible damage.
Prepare the Mounting Structure
Ensure that the mounting surface is rigid and suitable for the 115 mm frame size.
Secure the Motor
Install the motor using appropriate mounting hardware and the applicable mechanical installation procedure.
Avoid unnecessary force on the motor shaft.
Align the Shaft
Ensure that the motor shaft and driven machine mechanism are properly aligned.
Connect Electrical Circuits
Connect motor power, feedback, and grounding circuits according to the applicable servo-system configuration.
Manage Cables
Protect cables from sharp edges, excessive bending, heat sources, moving components, and other potential damage.
Commissioning Procedure
A structured commissioning procedure helps reduce unexpected motion and equipment damage.
Step 1: Verify Wiring
Check motor power, feedback, grounding, and control connections.
Step 2: Confirm Servo Drive Configuration
Verify that the drive configuration corresponds to the installed motor.
Step 3: Verify Feedback
Confirm that the servo drive receives valid feedback information.
Step 4: Check Mechanical Movement
Ensure that the machine axis can move freely without obstruction.
Step 5: Enable the Servo
Enable the servo drive according to the machine commissioning procedure.
Step 6: Perform Initial Motion Testing
Begin with controlled movement and observe the motor and machine response.
Step 7: Verify Direction
Confirm that commanded motor rotation corresponds to the intended machine movement.
Step 8: Test Positioning
Verify the required machine movement and positioning behavior.
Step 9: Adjust Servo Tuning
Tune the servo system according to the actual mechanical characteristics and application requirements.
Step 10: Test the Complete Machine
After individual-axis verification, perform a complete machine operating sequence.
Troubleshooting
Motor Does Not Rotate
Possible causes include:
- Servo drive disabled
- Incorrect motor configuration
- Motor power interruption
- Feedback connection problem
- Servo alarm
- Incorrect motion command
- Mechanical obstruction
Review the servo-drive diagnostic information before replacing the motor.
Positioning Is Inaccurate
Possible causes include:
- Feedback configuration problems
- Incorrect position scaling
- Mechanical backlash
- Coupling problems
- Incorrect servo tuning
- Excessive mechanical load
The motor, drive, feedback system, and mechanical transmission should be evaluated together.
Excessive Vibration
Potential causes include:
- Shaft misalignment
- Coupling problems
- Mechanical resonance
- Incorrect tuning
- Excessive load
- Mechanical wear
Both mechanical and control-system conditions should be investigated.
Motor Overheating
Possible causes include:
- Excessive load
- High duty cycle
- Insufficient cooling
- Mechanical resistance
- Incorrect drive configuration
- Operation outside applicable limits
Operating conditions should be checked against the applicable motor specifications.
Intermittent Operation
Potential causes include:
- Loose connectors
- Damaged motor cables
- Feedback interruptions
- Electrical interference
- Mechanical vibration
- Servo drive configuration problems
Inspect the complete system from the motion controller to the servo drive, motor, and feedback circuits.
Maintenance Recommendations
Inspect Motor Mounting
Check mounting hardware periodically for looseness or movement.
Check Shaft Alignment
Inspect the motor shaft and coupling for alignment problems.
Inspect Motor and Feedback Cables
Check for abrasion, cuts, excessive bending, loose connections, or other damage.
Monitor Temperature
Unexpected changes in motor temperature should be investigated.
Monitor Vibration
Increasing vibration can indicate mechanical wear, alignment problems, load changes, or servo-control issues.
Inspect Connectors
Ensure that motor and feedback connectors remain clean and securely connected.
Monitor Motion Performance
Changes in positioning accuracy, machine response, operating noise, or alarm frequency can provide early warning of developing problems.
Replacement Considerations
When replacing the Allen Bradley MPL-A420P-SK72AA, verify the complete model number and the requirements of the existing motion-control system.
Important identification details include:
- Manufacturer
- Complete motor model
- Frame size
- Nameplate information
- Feedback configuration
- Mounting arrangement
- Shaft configuration
- Connector arrangement
- Servo drive compatibility
- Machine load
- Application requirements
The supplied physical specifications are:
Frame Size: 115 mm
Weight: 4.3 kg
A replacement motor should not be selected solely according to frame size or external appearance.
The complete electrical, mechanical, feedback, and control requirements should be confirmed before installation.
Physical Size and Weight
The 115 mm frame size provides an important mechanical reference for machine integration and mounting design.
The supplied 4.3 kg weight should be considered during:
- Machine structural design
- Motor mounting
- Transportation
- Maintenance handling
- Spare-parts storage
- Equipment packaging
- Replacement planning
Frame size does not represent the complete external dimensions of the motor. Exact motor length, shaft dimensions, mounting-hole locations, connector positions, and other mechanical measurements should be verified from the appropriate technical drawing.
Servo System Architecture
A typical automation system incorporating the MPL-A420P-SK72AA may include:
| Component | Typical Function |
|---|---|
| PLC / Motion Controller | Generates motion commands |
| Servo Drive | Regulates motor operation |
| MPL-A420P-SK72AA | Produces controlled rotary motion |
| Feedback System | Provides motor operating information |
| Motor Cable | Transfers electrical power |
| Feedback Cable | Transfers feedback signals |
| Coupling | Connects motor to the mechanical system |
| Mechanical Transmission | Transfers motor movement |
| Machine Load | Performs the required process |
| HMI | Provides operator monitoring |
| Industrial Network | Exchanges control and diagnostic information |
The exact architecture depends on the machine design and selected automation equipment.
Engineering Best Practices
Match the Motor to the Load
The application should be evaluated for torque, speed, acceleration, load inertia, duty cycle, and mechanical requirements.
Use a Rigid Mounting Structure
A rigid mounting arrangement helps minimize vibration and unwanted mechanical movement.
Maintain Shaft Alignment
Correct alignment reduces coupling stress, vibration, and mechanical wear.
Protect Motor Cables
Motor and feedback cables should be routed securely and protected from mechanical damage.
Perform Servo Tuning
Servo parameters should be adjusted according to the actual machine mechanics and required motion response.
Monitor Operating Conditions
Temperature, vibration, positioning accuracy, and servo alarms should be monitored for abnormal changes.
Verify Replacement Components
Always confirm the complete MPL-A420P-SK72AA model before purchasing or installing a replacement.
Key Advantages
- 115 mm frame size for industrial machine integration
- 4.3 kg weight for practical installation and maintenance handling
- Designed for closed-loop servo motion control
- Supports controlled rotary movement
- Suitable for automated positioning
- Suitable for repetitive machine cycles
- Can participate in coordinated multi-axis motion
- Applicable to packaging and assembly machinery
- Suitable for material-handling and production automation
- Can be integrated into compatible Allen Bradley motion-control systems
Technical FAQs
What is the Allen Bradley MPL-A420P-SK72AA?
The Allen Bradley MPL-A420P-SK72AA is an industrial AC servo motor intended for automated motion-control applications.
What is the frame size of the MPL-A420P-SK72AA?
The supplied frame size is 115 mm.
What is the weight of the MPL-A420P-SK72AA?
The supplied weight is 4.3 kg.
What is the main function of this servo motor?
The motor converts controlled electrical power from a compatible servo drive into mechanical rotary motion for an automated machine axis.
What applications can use the MPL-A420P-SK72AA?
Potential applications include packaging, automated assembly, material handling, production machinery, machine tools, indexing systems, and other industrial motion-control applications when the complete system requirements are satisfied.
Does the 115 mm frame size specify all motor dimensions?
No. Frame size is a mechanical reference and does not provide every external measurement. Detailed mechanical drawings should be verified before machine installation.
What should be checked before replacing the motor?
The complete model number, motor nameplate information, electrical characteristics, feedback configuration, mounting arrangement, shaft configuration, servo-drive compatibility, and machine load should be verified.
What can cause servo motor vibration?
Possible causes include mechanical misalignment, coupling problems, machine resonance, excessive load, mechanical wear, or incorrect servo tuning.
Why is feedback important in a servo system?
Feedback provides information about motor operation, allowing the servo system to compare actual movement with commanded movement and regulate the axis.
How should the MPL-A420P-SK72AA be maintained?
Maintenance should include inspection of mounting hardware, shaft alignment, couplings, motor and feedback cables, connectors, temperature, vibration, and overall servo-system performance.
Conclusion
The Allen Bradley MPL-A420P-SK72AA Servo Motor is an industrial AC servo motor designed for integration into automated motion-control systems. With a supplied 115 mm frame size and 4.3 kg weight, it provides important physical information for machine design, mounting, transportation, maintenance, and replacement planning.
When combined with a compatible servo drive, motion controller, feedback system, and mechanical transmission, the MPL-A420P-SK72AA can support controlled rotary movement, positioning, speed regulation, indexing, repetitive motion, and coordinated machine-axis operation.
Reliable performance depends on correct motor selection, suitable servo-drive configuration, proper mechanical alignment, appropriate feedback integration, and systematic commissioning. Before installation or replacement, the complete motor model and applicable electrical and mechanical requirements should be verified to ensure proper integration with the intended industrial automation system.